drivers/phy/mediatek/phy-mtk-xsphy.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * MediaTek USB3.1 gen2 xsphy Driver
   4  *
   5  * Copyright (c) 2018 MediaTek Inc.
   6  * Author: Chunfeng Yun <chunfeng.yun@mediatek.com>
   7  *
   8  */
   9
  10 #include <dt-bindings/phy/phy.h>
  11 #include <linux/clk.h>
  12 #include <linux/delay.h>
  13 #include <linux/iopoll.h>
  14 #include <linux/module.h>
  15 #include <linux/of_address.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/platform_device.h>
  18
  19 #include "phy-mtk-io.h"
  20
  21 /* u2 phy banks */
  22 #define SSUSB_SIFSLV_MISC               0x000
  23 #define SSUSB_SIFSLV_U2FREQ             0x100
  24 #define SSUSB_SIFSLV_U2PHY_COM  0x300
  25
  26 /* u3 phy shared banks */
  27 #define SSPXTP_SIFSLV_DIG_GLB           0x000
  28 #define SSPXTP_SIFSLV_PHYA_GLB          0x100
  29
  30 /* u3 phy banks */
  31 #define SSPXTP_SIFSLV_DIG_LN_TOP        0x000
  32 #define SSPXTP_SIFSLV_DIG_LN_TX0        0x100
  33 #define SSPXTP_SIFSLV_DIG_LN_RX0        0x200
  34 #define SSPXTP_SIFSLV_DIG_LN_DAIF       0x300
  35 #define SSPXTP_SIFSLV_PHYA_LN           0x400
  36
  37 #define XSP_U2FREQ_FMCR0        ((SSUSB_SIFSLV_U2FREQ) + 0x00)
  38 #define P2F_RG_FREQDET_EN       BIT(24)
  39 #define P2F_RG_CYCLECNT         GENMASK(23, 0)
  40
  41 #define XSP_U2FREQ_MMONR0  ((SSUSB_SIFSLV_U2FREQ) + 0x0c)
  42
  43 #define XSP_U2FREQ_FMMONR1      ((SSUSB_SIFSLV_U2FREQ) + 0x10)
  44 #define P2F_RG_FRCK_EN          BIT(8)
  45 #define P2F_USB_FM_VALID        BIT(0)
  46
  47 #define XSP_USBPHYACR0  ((SSUSB_SIFSLV_U2PHY_COM) + 0x00)
  48 #define P2A0_RG_INTR_EN BIT(5)
  49
  50 #define XSP_USBPHYACR1          ((SSUSB_SIFSLV_U2PHY_COM) + 0x04)
  51 #define P2A1_RG_INTR_CAL                GENMASK(23, 19)
  52 #define P2A1_RG_VRT_SEL                 GENMASK(14, 12)
  53 #define P2A1_RG_TERM_SEL                GENMASK(10, 8)
  54
  55 #define XSP_USBPHYACR5          ((SSUSB_SIFSLV_U2PHY_COM) + 0x014)
  56 #define P2A5_RG_HSTX_SRCAL_EN   BIT(15)
  57 #define P2A5_RG_HSTX_SRCTRL             GENMASK(14, 12)
  58
  59 #define XSP_USBPHYACR6          ((SSUSB_SIFSLV_U2PHY_COM) + 0x018)
  60 #define P2A6_RG_BC11_SW_EN      BIT(23)
  61 #define P2A6_RG_OTG_VBUSCMP_EN  BIT(20)
  62
  63 #define XSP_U2PHYDTM1           ((SSUSB_SIFSLV_U2PHY_COM) + 0x06C)
  64 #define P2D_FORCE_IDDIG         BIT(9)
  65 #define P2D_RG_VBUSVALID        BIT(5)
  66 #define P2D_RG_SESSEND          BIT(4)
  67 #define P2D_RG_AVALID           BIT(2)
  68 #define P2D_RG_IDDIG            BIT(1)
  69
  70 #define SSPXTP_PHYA_GLB_00              ((SSPXTP_SIFSLV_PHYA_GLB) + 0x00)
  71 #define RG_XTP_GLB_BIAS_INTR_CTRL               GENMASK(21, 16)
  72
  73 #define SSPXTP_PHYA_LN_04       ((SSPXTP_SIFSLV_PHYA_LN) + 0x04)
  74 #define RG_XTP_LN0_TX_IMPSEL            GENMASK(4, 0)
  75
  76 #define SSPXTP_PHYA_LN_14       ((SSPXTP_SIFSLV_PHYA_LN) + 0x014)
  77 #define RG_XTP_LN0_RX_IMPSEL            GENMASK(4, 0)
  78
  79 #define XSP_REF_CLK             26      /* MHZ */
  80 #define XSP_SLEW_RATE_COEF      17
  81 #define XSP_SR_COEF_DIVISOR     1000
  82 #define XSP_FM_DET_CYCLE_CNT    1024
  83
  84 struct xsphy_instance {
  85         struct phy *phy;
  86         void __iomem *port_base;
  87         struct clk *ref_clk;    /* reference clock of anolog phy */
  88         u32 index;
  89         u32 type;
  90         /* only for HQA test */
  91         int efuse_intr;
  92         int efuse_tx_imp;
  93         int efuse_rx_imp;
  94         /* u2 eye diagram */
  95         int eye_src;
  96         int eye_vrt;
  97         int eye_term;
  98 };
  99
 100 struct mtk_xsphy {
 101         struct device *dev;
 102         void __iomem *glb_base; /* only shared u3 sif */
 103         struct xsphy_instance **phys;
 104         int nphys;
 105         int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */
 106         int src_coef;    /* coefficient for slew rate calibrate */
 107 };
 108
 109 static void u2_phy_slew_rate_calibrate(struct mtk_xsphy *xsphy,
 110                                         struct xsphy_instance *inst)
 111 {
 112         void __iomem *pbase = inst->port_base;
 113         int calib_val;
 114         int fm_out;
 115         u32 tmp;
 116
 117         /* use force value */
 118         if (inst->eye_src)
 119                 return;
 120
 121         /* enable USB ring oscillator */
 122         mtk_phy_set_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
 123         udelay(1);      /* wait clock stable */
 124
 125         /* enable free run clock */
 126         mtk_phy_set_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
 127
 128         /* set cycle count as 1024 */
 129         mtk_phy_update_field(pbase + XSP_U2FREQ_FMCR0, P2F_RG_CYCLECNT,
 130                              XSP_FM_DET_CYCLE_CNT);
 131
 132         /* enable frequency meter */
 133         mtk_phy_set_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
 134
 135         /* ignore return value */
 136         readl_poll_timeout(pbase + XSP_U2FREQ_FMMONR1, tmp,
 137                            (tmp & P2F_USB_FM_VALID), 10, 200);
 138
 139         fm_out = readl(pbase + XSP_U2FREQ_MMONR0);
 140
 141         /* disable frequency meter */
 142         mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMCR0, P2F_RG_FREQDET_EN);
 143
 144         /* disable free run clock */
 145         mtk_phy_clear_bits(pbase + XSP_U2FREQ_FMMONR1, P2F_RG_FRCK_EN);
 146
 147         if (fm_out) {
 148                 /* (1024 / FM_OUT) x reference clock frequency x coefficient */
 149                 tmp = xsphy->src_ref_clk * xsphy->src_coef;
 150                 tmp = (tmp * XSP_FM_DET_CYCLE_CNT) / fm_out;
 151                 calib_val = DIV_ROUND_CLOSEST(tmp, XSP_SR_COEF_DIVISOR);
 152         } else {
 153                 /* if FM detection fail, set default value */
 154                 calib_val = 3;
 155         }
 156         dev_dbg(xsphy->dev, "phy.%d, fm_out:%d, calib:%d (clk:%d, coef:%d)\n",
 157                 inst->index, fm_out, calib_val,
 158                 xsphy->src_ref_clk, xsphy->src_coef);
 159
 160         /* set HS slew rate */
 161         mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL, calib_val);
 162
 163         /* disable USB ring oscillator */
 164         mtk_phy_clear_bits(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCAL_EN);
 165 }
 166
 167 static void u2_phy_instance_init(struct mtk_xsphy *xsphy,
 168                                  struct xsphy_instance *inst)
 169 {
 170         void __iomem *pbase = inst->port_base;
 171
 172         /* DP/DM BC1.1 path Disable */
 173         mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_BC11_SW_EN);
 174
 175         mtk_phy_set_bits(pbase + XSP_USBPHYACR0, P2A0_RG_INTR_EN);
 176 }
 177
 178 static void u2_phy_instance_power_on(struct mtk_xsphy *xsphy,
 179                                      struct xsphy_instance *inst)
 180 {
 181         void __iomem *pbase = inst->port_base;
 182         u32 index = inst->index;
 183
 184         mtk_phy_set_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
 185
 186         mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
 187                             P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
 188                             P2D_RG_VBUSVALID | P2D_RG_AVALID);
 189
 190         dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
 191 }
 192
 193 static void u2_phy_instance_power_off(struct mtk_xsphy *xsphy,
 194                                       struct xsphy_instance *inst)
 195 {
 196         void __iomem *pbase = inst->port_base;
 197         u32 index = inst->index;
 198
 199         mtk_phy_clear_bits(pbase + XSP_USBPHYACR6, P2A6_RG_OTG_VBUSCMP_EN);
 200
 201         mtk_phy_update_bits(pbase + XSP_U2PHYDTM1,
 202                             P2D_RG_VBUSVALID | P2D_RG_AVALID | P2D_RG_SESSEND,
 203                             P2D_RG_SESSEND);
 204
 205         dev_dbg(xsphy->dev, "%s(%d)\n", __func__, index);
 206 }
 207
 208 static void u2_phy_instance_set_mode(struct mtk_xsphy *xsphy,
 209                                      struct xsphy_instance *inst,
 210                                      enum phy_mode mode)
 211 {
 212         u32 tmp;
 213
 214         tmp = readl(inst->port_base + XSP_U2PHYDTM1);
 215         switch (mode) {
 216         case PHY_MODE_USB_DEVICE:
 217                 tmp |= P2D_FORCE_IDDIG | P2D_RG_IDDIG;
 218                 break;
 219         case PHY_MODE_USB_HOST:
 220                 tmp |= P2D_FORCE_IDDIG;
 221                 tmp &= ~P2D_RG_IDDIG;
 222                 break;
 223         case PHY_MODE_USB_OTG:
 224                 tmp &= ~(P2D_FORCE_IDDIG | P2D_RG_IDDIG);
 225                 break;
 226         default:
 227                 return;
 228         }
 229         writel(tmp, inst->port_base + XSP_U2PHYDTM1);
 230 }
 231
 232 static void phy_parse_property(struct mtk_xsphy *xsphy,
 233                                 struct xsphy_instance *inst)
 234 {
 235         struct device *dev = &inst->phy->dev;
 236
 237         switch (inst->type) {
 238         case PHY_TYPE_USB2:
 239                 device_property_read_u32(dev, "mediatek,efuse-intr",
 240                                          &inst->efuse_intr);
 241                 device_property_read_u32(dev, "mediatek,eye-src",
 242                                          &inst->eye_src);
 243                 device_property_read_u32(dev, "mediatek,eye-vrt",
 244                                          &inst->eye_vrt);
 245                 device_property_read_u32(dev, "mediatek,eye-term",
 246                                          &inst->eye_term);
 247                 dev_dbg(dev, "intr:%d, src:%d, vrt:%d, term:%d\n",
 248                         inst->efuse_intr, inst->eye_src,
 249                         inst->eye_vrt, inst->eye_term);
 250                 break;
 251         case PHY_TYPE_USB3:
 252                 device_property_read_u32(dev, "mediatek,efuse-intr",
 253                                          &inst->efuse_intr);
 254                 device_property_read_u32(dev, "mediatek,efuse-tx-imp",
 255                                          &inst->efuse_tx_imp);
 256                 device_property_read_u32(dev, "mediatek,efuse-rx-imp",
 257                                          &inst->efuse_rx_imp);
 258                 dev_dbg(dev, "intr:%d, tx-imp:%d, rx-imp:%d\n",
 259                         inst->efuse_intr, inst->efuse_tx_imp,
 260                         inst->efuse_rx_imp);
 261                 break;
 262         default:
 263                 dev_err(xsphy->dev, "incompatible phy type\n");
 264                 return;
 265         }
 266 }
 267
 268 static void u2_phy_props_set(struct mtk_xsphy *xsphy,
 269                              struct xsphy_instance *inst)
 270 {
 271         void __iomem *pbase = inst->port_base;
 272
 273         if (inst->efuse_intr)
 274                 mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_INTR_CAL,
 275                                      inst->efuse_intr);
 276
 277         if (inst->eye_src)
 278                 mtk_phy_update_field(pbase + XSP_USBPHYACR5, P2A5_RG_HSTX_SRCTRL,
 279                                      inst->eye_src);
 280
 281         if (inst->eye_vrt)
 282                 mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_VRT_SEL,
 283                                      inst->eye_vrt);
 284
 285         if (inst->eye_term)
 286                 mtk_phy_update_field(pbase + XSP_USBPHYACR1, P2A1_RG_TERM_SEL,
 287                                      inst->eye_term);
 288 }
 289
 290 static void u3_phy_props_set(struct mtk_xsphy *xsphy,
 291                              struct xsphy_instance *inst)
 292 {
 293         void __iomem *pbase = inst->port_base;
 294
 295         if (inst->efuse_intr)
 296                 mtk_phy_update_field(xsphy->glb_base + SSPXTP_PHYA_GLB_00,
 297                                      RG_XTP_GLB_BIAS_INTR_CTRL, inst->efuse_intr);
 298
 299         if (inst->efuse_tx_imp)
 300                 mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_04,
 301                                      RG_XTP_LN0_TX_IMPSEL, inst->efuse_tx_imp);
 302
 303         if (inst->efuse_rx_imp)
 304                 mtk_phy_update_field(pbase + SSPXTP_PHYA_LN_14,
 305                                      RG_XTP_LN0_RX_IMPSEL, inst->efuse_rx_imp);
 306 }
 307
 308 static int mtk_phy_init(struct phy *phy)
 309 {
 310         struct xsphy_instance *inst = phy_get_drvdata(phy);
 311         struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
 312         int ret;
 313
 314         ret = clk_prepare_enable(inst->ref_clk);
 315         if (ret) {
 316                 dev_err(xsphy->dev, "failed to enable ref_clk\n");
 317                 return ret;
 318         }
 319
 320         switch (inst->type) {
 321         case PHY_TYPE_USB2:
 322                 u2_phy_instance_init(xsphy, inst);
 323                 u2_phy_props_set(xsphy, inst);
 324                 break;
 325         case PHY_TYPE_USB3:
 326                 u3_phy_props_set(xsphy, inst);
 327                 break;
 328         default:
 329                 dev_err(xsphy->dev, "incompatible phy type\n");
 330                 clk_disable_unprepare(inst->ref_clk);
 331                 return -EINVAL;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int mtk_phy_power_on(struct phy *phy)
 338 {
 339         struct xsphy_instance *inst = phy_get_drvdata(phy);
 340         struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
 341
 342         if (inst->type == PHY_TYPE_USB2) {
 343                 u2_phy_instance_power_on(xsphy, inst);
 344                 u2_phy_slew_rate_calibrate(xsphy, inst);
 345         }
 346
 347         return 0;
 348 }
 349
 350 static int mtk_phy_power_off(struct phy *phy)
 351 {
 352         struct xsphy_instance *inst = phy_get_drvdata(phy);
 353         struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
 354
 355         if (inst->type == PHY_TYPE_USB2)
 356                 u2_phy_instance_power_off(xsphy, inst);
 357
 358         return 0;
 359 }
 360
 361 static int mtk_phy_exit(struct phy *phy)
 362 {
 363         struct xsphy_instance *inst = phy_get_drvdata(phy);
 364
 365         clk_disable_unprepare(inst->ref_clk);
 366         return 0;
 367 }
 368
 369 static int mtk_phy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
 370 {
 371         struct xsphy_instance *inst = phy_get_drvdata(phy);
 372         struct mtk_xsphy *xsphy = dev_get_drvdata(phy->dev.parent);
 373
 374         if (inst->type == PHY_TYPE_USB2)
 375                 u2_phy_instance_set_mode(xsphy, inst, mode);
 376
 377         return 0;
 378 }
 379
 380 static struct phy *mtk_phy_xlate(struct device *dev,
 381                                  struct of_phandle_args *args)
 382 {
 383         struct mtk_xsphy *xsphy = dev_get_drvdata(dev);
 384         struct xsphy_instance *inst = NULL;
 385         struct device_node *phy_np = args->np;
 386         int index;
 387
 388         if (args->args_count != 1) {
 389                 dev_err(dev, "invalid number of cells in 'phy' property\n");
 390                 return ERR_PTR(-EINVAL);
 391         }
 392
 393         for (index = 0; index < xsphy->nphys; index++)
 394                 if (phy_np == xsphy->phys[index]->phy->dev.of_node) {
 395                         inst = xsphy->phys[index];
 396                         break;
 397                 }
 398
 399         if (!inst) {
 400                 dev_err(dev, "failed to find appropriate phy\n");
 401                 return ERR_PTR(-EINVAL);
 402         }
 403
 404         inst->type = args->args[0];
 405         if (!(inst->type == PHY_TYPE_USB2 ||
 406               inst->type == PHY_TYPE_USB3)) {
 407                 dev_err(dev, "unsupported phy type: %d\n", inst->type);
 408                 return ERR_PTR(-EINVAL);
 409         }
 410
 411         phy_parse_property(xsphy, inst);
 412
 413         return inst->phy;
 414 }
 415
 416 static const struct phy_ops mtk_xsphy_ops = {
 417         .init           = mtk_phy_init,
 418         .exit           = mtk_phy_exit,
 419         .power_on       = mtk_phy_power_on,
 420         .power_off      = mtk_phy_power_off,
 421         .set_mode       = mtk_phy_set_mode,
 422         .owner          = THIS_MODULE,
 423 };
 424
 425 static const struct of_device_id mtk_xsphy_id_table[] = {
 426         { .compatible = "mediatek,xsphy", },
 427         { },
 428 };
 429 MODULE_DEVICE_TABLE(of, mtk_xsphy_id_table);
 430
 431 static int mtk_xsphy_probe(struct platform_device *pdev)
 432 {
 433         struct device *dev = &pdev->dev;
 434         struct device_node *np = dev->of_node;
 435         struct device_node *child_np;
 436         struct phy_provider *provider;
 437         struct resource *glb_res;
 438         struct mtk_xsphy *xsphy;
 439         struct resource res;
 440         int port, retval;
 441
 442         xsphy = devm_kzalloc(dev, sizeof(*xsphy), GFP_KERNEL);
 443         if (!xsphy)
 444                 return -ENOMEM;
 445
 446         xsphy->nphys = of_get_child_count(np);
 447         xsphy->phys = devm_kcalloc(dev, xsphy->nphys,
 448                                        sizeof(*xsphy->phys), GFP_KERNEL);
 449         if (!xsphy->phys)
 450                 return -ENOMEM;
 451
 452         xsphy->dev = dev;
 453         platform_set_drvdata(pdev, xsphy);
 454
 455         glb_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 456         /* optional, may not exist if no u3 phys */
 457         if (glb_res) {
 458                 /* get banks shared by multiple u3 phys */
 459                 xsphy->glb_base = devm_ioremap_resource(dev, glb_res);
 460                 if (IS_ERR(xsphy->glb_base)) {
 461                         dev_err(dev, "failed to remap glb regs\n");
 462                         return PTR_ERR(xsphy->glb_base);
 463                 }
 464         }
 465
 466         xsphy->src_ref_clk = XSP_REF_CLK;
 467         xsphy->src_coef = XSP_SLEW_RATE_COEF;
 468         /* update parameters of slew rate calibrate if exist */
 469         device_property_read_u32(dev, "mediatek,src-ref-clk-mhz",
 470                                  &xsphy->src_ref_clk);
 471         device_property_read_u32(dev, "mediatek,src-coef", &xsphy->src_coef);
 472
 473         port = 0;
 474         for_each_child_of_node(np, child_np) {
 475                 struct xsphy_instance *inst;
 476                 struct phy *phy;
 477
 478                 inst = devm_kzalloc(dev, sizeof(*inst), GFP_KERNEL);
 479                 if (!inst) {
 480                         retval = -ENOMEM;
 481                         goto put_child;
 482                 }
 483
 484                 xsphy->phys[port] = inst;
 485
 486                 phy = devm_phy_create(dev, child_np, &mtk_xsphy_ops);
 487                 if (IS_ERR(phy)) {
 488                         dev_err(dev, "failed to create phy\n");
 489                         retval = PTR_ERR(phy);
 490                         goto put_child;
 491                 }
 492
 493                 retval = of_address_to_resource(child_np, 0, &res);
 494                 if (retval) {
 495                         dev_err(dev, "failed to get address resource(id-%d)\n",
 496                                 port);
 497                         goto put_child;
 498                 }
 499
 500                 inst->port_base = devm_ioremap_resource(&phy->dev, &res);
 501                 if (IS_ERR(inst->port_base)) {
 502                         dev_err(dev, "failed to remap phy regs\n");
 503                         retval = PTR_ERR(inst->port_base);
 504                         goto put_child;
 505                 }
 506
 507                 inst->phy = phy;
 508                 inst->index = port;
 509                 phy_set_drvdata(phy, inst);
 510                 port++;
 511
 512                 inst->ref_clk = devm_clk_get(&phy->dev, "ref");
 513                 if (IS_ERR(inst->ref_clk)) {
 514                         dev_err(dev, "failed to get ref_clk(id-%d)\n", port);
 515                         retval = PTR_ERR(inst->ref_clk);
 516                         goto put_child;
 517                 }
 518         }
 519
 520         provider = devm_of_phy_provider_register(dev, mtk_phy_xlate);
 521         return PTR_ERR_OR_ZERO(provider);
 522
 523 put_child:
 524         of_node_put(child_np);
 525         return retval;
 526 }
 527
 528 static struct platform_driver mtk_xsphy_driver = {
 529         .probe          = mtk_xsphy_probe,
 530         .driver         = {
 531                 .name   = "mtk-xsphy",
 532                 .of_match_table = mtk_xsphy_id_table,
 533         },
 534 };
 535
 536 module_platform_driver(mtk_xsphy_driver);
 537
 538 MODULE_AUTHOR("Chunfeng Yun <chunfeng.yun@mediatek.com>");
 539 MODULE_DESCRIPTION("MediaTek USB XS-PHY driver");
 540 MODULE_LICENSE("GPL v2");